Introduce github actions pull request workflow

Author: Oryan M

.github/workflows/pull-request.yml

@@ -0,0 +1,24 @@
+name: "Pull request"
+on:
+  pull_request:
+    types: [ opened, reopened, synchronize ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup java
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+      - name: Cache Maven packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+          restore-keys: ${{ runner.os }}-m2
+      - name: Build with Maven
+        run: mvn --batch-mode --update-snapshots verify
+